soft function
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Mathematics ◽  
2021 ◽  
Vol 9 (18) ◽  
pp. 2182
Author(s):  
Osman Kazancı ◽  
Sarka Hoskova-Mayerova ◽  
Bijan Davvaz

The goal of this paper is to introduce a novel soft hyperstructure called multi-fuzzy soft hyperstructure. We investigate the notion of multi-fuzzy soft hypermodules and some of their structural properties are discussed. We discuss the behavior image and inverse image of a multi-fuzzy soft set under the multi-fuzzy soft function. According to Zadeh’s extension principle, we prove that the image and inverse image of a multi-fuzzy soft hypermodules are further multi-fuzzy soft hypermodule.


2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Ze Long Liu ◽  
Maximilian Stahlhofen

Abstract We calculate the three-loop soft function for the production of an electroweak boson (Higgs, γ, W±, Z) with large transverse momentum at a hadron collider. It is the first time a soft function for a three-parton process is computed at next-to-next-to-next-to-leading order (N3LO). As a technical novelty, we perform the calculation in terms of forward-scattering-type loop diagrams rather than evaluating phase space integrals. Our three-loop result contains color-tripole contributions and explicitly confirms predictions on the universal infrared structure of QCD scattering amplitudes with three massless parton legs. The soft function is a central ingredient in the factorized cross section for electroweak boson production near the kinematic endpoint (threshold), where the invariant mass of the recoiling hadronic radiation is small compared to its transverse momentum. Our result is required for predictions of the near-threshold cross sections at N3LO and for the resummation of threshold logarithms at primed next-to-next-to-next-to-leading logarithmic (N3LL′) accuracy.


2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Rafael F. del Castillo ◽  
Miguel G. Echevarria ◽  
Yiannis Makris ◽  
Ignazio Scimemi

Abstract We study a transverse momentum dependent (TMD) factorization framework for the processes of dijet and heavy-meson pair production in deep-inelastic-scattering in an electron-proton collider, considering the measurement of the transverse momentum imbalance of the two hard probes in the Breit frame. For the factorization theorem we employ soft-collinear and boosted-heavy-quark effective field theories. The factorized cross-section for both processes is sensitive to gluon unpolarized and linearly polarized TMD distributions and requires the introduction of a new soft function. We calculate the new soft function here at one-loop, regulating rapidity divergences with the δ-regulator. In addition, using a factorization consistency relation and a universality argument regarding the heavy-quark jet function, we obtain the anomalous dimension of the new soft function at two and three loops.


2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Hai Tao Li ◽  
Ivan Vitev ◽  
Yu Jiao Zhu

Abstract Event shape observables have been widely used for precision QCD studies at various lepton and hadron colliders. We present the most accurate calculation of the transverse-energy-energy correlation event shape variable in deep-inelastic scattering. In the framework of soft-collinear effective theory the cross section is factorized as the convolution of the hard function, beam function, jet function and soft function in the back-to-back limit. A close connection to TMD factorization is established, as the beam function when combined with part of the soft function is identical to the conventional TMD parton distribution function, and the jet function is the second moment of the TMD fragmentation function matching coefficient. We validate our framework by comparing the obtained LO and NLO leading singular distributions to the full QCD calculations in the back-to-back limit. We report the resummed transverse-energy-energy correlation distributions up to N3LL accuracy matched with the NLO cross section for the production of a lepton and two jets. Our work provides a new way to precisely study TMD physics at the future Electron-Ion Collider.


2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
Ze Long Liu ◽  
Bianka Mecaj ◽  
Matthias Neubert ◽  
Xing Wang ◽  
Sean Fleming

2020 ◽  
Vol 955 ◽  
pp. 115054 ◽  
Author(s):  
Xiangdong Ji ◽  
Yizhuang Liu ◽  
Yu-Sheng Liu

2020 ◽  
Vol 1 (2) ◽  
pp. 54-60
Author(s):  
Imran Imran ◽  
Handar Subhandi Bakhtiar ◽  
Dirga Achmad

The Regional Representative Council (DPD) as a regional representative institution is located as a state institution. The existence of the DPD reflects the principle of territorial or regional representation (regional representation). Therefore, as a representative institution, the DPD should ideally have the legislative, supervisory and budgetary functions as well as the House of Representatives (DPR). However, the DPD as a representative institution with these three functions actually has a very weak and soft function. The two chambers of the House of Representatives (DPR and DPD) do not have balanced authority. DPD and DPR are two rooms (houses, chambers) whose authority is not balanced, because it is classified as soft bicameral.


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